diff --git a/configure.ac b/configure.ac
index 53d60b4630031d635e3db9c43ee7a705a985cedb..840291f4f274d142a869478fdb53a00afe5a5979 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 AC_INIT(nomad, 3.6.1, miroslav.shaltev@shaltev.de)
-AC_PREREQ([2.67])
+AC_PREREQ([2.63])
 AC_CONFIG_HEADERS([config.h])
 
 # Checks for programs.